Who made this ring that says 18KGERSC?

The ring marked "18KGERSC" likely indicates it is made of 18-karat gold, with "ERSC" possibly representing a brand or designer. Without more context, it's challenging to identify the specific maker, as many jewelers could use similar markings. If "ERSC" refers to a well-known designer or brand, researching that name could provide more insight. For a precise identification, examining the ring for additional hallmarks or contacting a jeweler would be helpful.